Elevator Warp

Your goal is simple. Take the elevator to floor 6. But this is no ordinary elevator... Who knows where you'll end up. A hotel, dungeon, hedge maze, a train? You must travel from floor 1 to 6, working out if each floor is valid or not. If a floor is not valid, you must press the emergency button and don't continue up, or you have to start all over again! How do you know if a f…